How to choose a dry-type transformer cooling fan manufacturer

I. Technical compliance (bottom line requirements)

• industry standard: It must be clear that the manufacturer's product complies with JB/T8971-1999 Cross-flow cooling fan for dry-type transformerThe
• Type test report: Require manufacturers to provide type test reports issued by a third party (such as the National Transformer Quality Supervision and Inspection Center) to verify key parameters such as air volume, noise, temperature rise, and so on.

II. Adaptability (core indicator)

• capacity coverage: High quality manufacturers should be able to provide a full range of fans from 30kVA to 25000kVA, GFDD series, etc.
• Structural flexibilityTop Blow/Side Blow/Extension customization is required to adapt to different transformer structures.
• Adaptation to special environmentsHigh salt spray environment such as offshore wind power requires stainless steel (SUS304) housing + waterproof coating.

III. Quality reliability (long-term costs)

• Key components::
  • Motor: Requires the use of Cold Rolled Silicon Steel Sheet Core + NSK/NTN Bearing, such as the InnoTech GFDD series is clearly labeled.
  • Impeller: Aluminum alloy dynamic balance adjustment to avoid transformer winding damage caused by vibration.
• Warranty Policy: The industry mainstream is 1 Year Warranty + Lifetime RepairThe

IV. Service capacity (risk aversion)

• responsiveness: Preferences 24-hour technical support The manufacturers.
• Spare parts supply: Requirement of manufacturer's commitment Spare parts supply within 10 yearsTo avoid the inability to replace the turbine during the life cycle of the transformer.

V. Cost transparency (hidden traps)

• Price range reference(July 2025 Quote):

  Model Example	Air volume (m³/h)	Power (W)	Unit price including tax (yuan)
  GFDD470-150	750	80	xxxx
  GFDD590-155	1200	120	xxxx
  GFDD780-185	1850	200	xxxx

• Beware of low price traps: Fans below $xxxx are mostly aluminum wire motors or refurbished second-hand, which can cause the transformer to overheat and burn out.

List of recommended manufacturers (by scenario)